problem with Mr. noise

[HAMZAZAYYAD]

hi all

I designed a PCB board with 16f84a microcontroller for a motor
and operate normally.

when I put a PCB board beside the motor does not work normally.


I think my project effected by noise and I need a solution with it.

I need to isolate the frequencies of motor away of frequencies of a PCB board.

I NEED YOUR HELP.


best regards

 

[Nigel Goodwin]

Your description is far too vague!.

For a start, do you have the normal supression components around the motor? - post a COMPLETE circuit, showing EVERY component.

 

[mstechca]

hi all

I designed a PCB board with 16f84a microcontroller for a motor
and operate normally.

when I put a PCB board beside the motor does not work normally.


I think my project effected by noise and I need a solution with it.

I need to isolate the frequencies of motor away of frequencies of a PCB board.

I NEED YOUR HELP.


best regards

The only obvious thing that comes to mind is that your PCB isn't covered and is touching the metal casing of the motor. I am making the assumption that the casing conducts electricity. If I am correct, then you may have created a short circuit.

and a Printed circuit board cannot generate frequencies unless it is used with an oscillator circuit.

 

[i_build_stuff]

That sounds like a fairly typical EMC problem--either the rotating magnetic field or RF noise from the brushes (if present) is getting into the board + causing interference. Possible solutions (in order of complexity) might be:

-Move the controller away from the motor.

-Switch to a lower-noise motor.

-Shield the controller by placing it in a conductive, grounded box (a steel box is recommended due to its magnetic properties). Also, consider adding a ground plane to the controller board.

-Shield ALL lines going in or out of the controller and / or position them away from the motor--this includes power lines. Also, power lines should be filtered when they enter the controller board.

-Reposition the controller to minimize specific types of interference (ie, no pulsing B lines normal to the board).

-Harden the controller itself against interference by identifying / minimizing sensitive points. For example, signal lines should be low-impedance to minimize induced voltages.

-Get the device to an EMC lab and do a proper analysis on the noise output / susceptibility for all components. Use the results to make the appropriate modifications.

-Get a copy of Maxwell or some other EM simulator and do basically the same thing.